Old HistoryWhile the term “eSSB”
is a relatively new term used to describe the extended nature of higher
fidelity single sideband (coined January of 2003 by NU9N), the
experimentation with high
fidelity single sideband is not so new.
Amateur radio operators have been experimenting with good single
sideband audio, in one way or another, ever since single sideband was
developed.

However, fairly recent changes in
technology, with the introduction of “Digital Signal Processing” (DSP)
and better I.F. filter schemes, have made high-fidelity SSB much more
widely available. Therefore, it is
the last few generations of amateur
radio technology and the operators who have taken advantage of it, that
will be covered here regarding eSSB history.